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Homework Statement
Ok so I was trying to find the range of the equation below, commen sense and simply looking at it yields that the range is set of all reals... I however used calculus to find the critical points, I've always been told that there are none when the range is the set of all reals as it would be the point were y equals positive and negative infinity, hence these points are never reached and the equation never "turns around", but I found some, I don't see what I have done wrong there are defined critical values and I believe I found them, I'm just confused becasue that would mean what exactly? infinity in the set of all reals can be defined in the complex number system... Can somone please explain to me why I got an answer and what it means, i.e. I know why I got an answer don't understand what it means... also please see my question at the bottom of the picture... also please tell me the trute lol no lies like how people are normally told
cos(x)=-2
has no solution as that is a complete lie as there are an infinite amount of solutions so to say there isn't one is just wrong lol... so the truth only please :O
Homework Equations
see below
The Attempt at a Solution
I included my work step by step just incase you think i was suppose to get a giant explosion when solving and didn't get one, because "I wasn't suppose to get a solution", I don't see what I did wrong...
http://img844.imageshack.us/img844/7654/61037261.jpg
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